What is Multiple Access?
Simultaneous private use of a transmission medium by multiple, independent users.

Advantages of Multiple Access

Increased capacity: serve more users
Reduced capital requirements since fewer media can carry the traffic
Decreased per-user expense
Easier to manage and administer

MOST POPULER MULTIPLE ACCESS TECHNOLOGIES THAT ESTABLISHED CHANNELS

FDMA (Frequency Division Multiplex Access)
each user on a different frequency
a channel is a frequency

TDMA (Time Division Multiplex Access)
each user on a different window period
in time (“time slot”)
a channel is a specific time slot on a specific frequency

CDMA (Code Division Multiplex Access)
each user uses the same frequency all the time
, but mixed With different distinguishing code patterns
a channel is a unique set of code patterns